pi=0
N = 100
for k in range(N):
    pi+=1/pow(16,k)*(4/(8*k+1)-2/(8*k+4)-1/(8*k+5)-1/(8*k+6))
print("圆周率的值为:{}".format(pi))
"""
pi+=1/pow(16,k)*\
    (4/(8*k+1)-\
     2/(8*k+4)-1/\
     (8*k+5)-1/\
     (8*k+6))
"""
